feat(core, angular, react, vue): allow customizations to pie labels & the donut center number (#427)

Author: theiliad

packages/core/src/components/graphs/donut.ts

@@ -7,51 +7,36 @@ import { Tools } from "../../tools";
 import { select } from "d3-selection";
 import { interpolateNumber } from "d3-interpolate";
 
-const donutCenterNumberTween = (d3Ref, newNumber: number) => {
-	// Remove commas from the current value string, and convert to an int
-	const currentValue = parseInt(d3Ref.text().replace(/[, ]+/g, ""), 10) || 0;
-	const i = interpolateNumber(currentValue, newNumber);
-
-	const formatInterpolatedValue = number => Math.floor(number).toLocaleString();
-
-	return t => d3Ref.text(formatInterpolatedValue(i(t)));
-};
-
 export class Donut extends Pie {
 	type = "donut";
 
 	render(animate = true) {
 		// Call render() from Pie
 		super.render(animate);
 
+		const self = this;
+
 		const svg = DOMUtils.appendOrSelect(this.getContainerSVG(), "g.center");
 		const options = this.model.getOptions();
 
 		// Compute the outer radius needed
 		const radius = this.computeRadius();
 
-		let donutCenterFigure = Tools.getProperty(options, "center", "number");
-		if (!donutCenterFigure) {
-			donutCenterFigure = this.getDataList().reduce((accumulator, d) => {
-				return accumulator + d.value;
-			}, 0);
-		}
-
 		// Add the number shown in the center of the donut
 		DOMUtils.appendOrSelect(svg, "text.donut-figure")
 			.attr("text-anchor", "middle")
 			.style("font-size", () => options.donut.center.numberFontSize(radius))
 			.transition(this.services.transitions.getTransition("donut-figure-enter-update", animate))
 			.tween("text", function() {
-				return donutCenterNumberTween(select(this), donutCenterFigure);
+				return self.centerNumberTween(select(this));
 			});
 
 		// Add the label below the number in the center of the donut
 		DOMUtils.appendOrSelect(svg, "text.donut-title")
 			.attr("text-anchor", "middle")
 			.style("font-size", () => options.donut.center.titleFontSize(radius))
 			.attr("y", options.donut.center.titleYPosition(radius))
-			.text(options.donut.center.label);
+			.text(Tools.getProperty(options, "donut", "center", "label"));
 	}
 
 	getInnerRadius() {
@@ -60,4 +45,24 @@ export class Donut extends Pie {
 
 		return radius * (3 / 4);
 	}
+
+	centerNumberTween(d3Ref) {
+		const options = this.model.getOptions();
+
+		let donutCenterFigure = Tools.getProperty(options, "donut", "center", "number");
+		if (!donutCenterFigure) {
+			donutCenterFigure = this.getDataList().reduce((accumulator, d) => {
+				return accumulator + d.value;
+			}, 0);
+		}
+
+		// Remove commas from the current value string, and convert to an int
+		const currentValue = parseInt(d3Ref.text().replace(/[, ]+/g, ""), 10) || 0;
+		const i = interpolateNumber(currentValue, donutCenterFigure);
+
+		return t => {
+			const { numberFormatter } = options.donut.center;
+			d3Ref.text(numberFormatter(i(t)));
+		};
+	}
 }

packages/core/src/components/graphs/pie.ts

@@ -124,7 +124,13 @@ export class Pie extends Component {
 		const calloutData = [];
 		enteringLabels.merge(labels)
 			.style("text-anchor", "middle")
-			.text(d => Tools.convertValueToPercentage(d.data.value, dataList) + "%")
+			.text(d => {
+				if (options.pie.labels.formatter) {
+					return options.pie.labels.formatter(d);
+				}
+
+				return Tools.convertValueToPercentage(d.data.value, dataList) + "%";
+			})
 			// Calculate dimensions in order to transform
 			.datum(function(d) {
 				const textLength = this.getComputedTextLength();

packages/core/src/configuration.ts

@@ -202,6 +202,9 @@ const pieChart: PieChartOptions = Tools.merge({}, chart, {
 			offsetY: 12,
 			horizontalLineLength: 8,
 			textMargin: 2
+		},
+		labels: {
+			formatter: null
 		}
 	}
 } as PieChartOptions);
@@ -214,7 +217,8 @@ const donutChart: DonutChartOptions = Tools.merge({}, pieChart, {
 		center: {
 			numberFontSize: radius => Math.min((radius / 100) * 24, 24) + "px",
 			titleFontSize: radius => Math.min((radius / 100) * 15, 15) + "px",
-			titleYPosition: radius => Math.min((radius / 80) * 20, 20)
+			titleYPosition: radius => Math.min((radius / 80) * 20, 20),
+			numberFormatter: number => Math.floor(number).toLocaleString()
 		}
 	}
 } as DonutChartOptions);

packages/core/src/interfaces/charts.ts

@@ -129,6 +129,9 @@ export interface PieChartOptions extends BaseChartOptions {
 			offsetY?: number;
 			horizontalLineLength?: number;
 			textMargin?: number;
+		},
+		labels?: {
+			formatter?: Function;
 		}
 	};
 }
@@ -144,6 +147,7 @@ export interface DonutChartOptions extends PieChartOptions {
 			numberFontSize?: Function;
 			titleFontSize?: Function;
 			titleYPosition?: Function;
+			numberFormatter?: Function;
 		};
 	};
 }